I am bit sceptical, but I hope it works. Company that I work is part of project that drills geothermal to 7km deep. This tech is challenging in general.
300 000 homes sounds to me near impossible. Also article talks 3,6MW, but doesn’t specify is it MWt or MWe. I assume it is heat, which to converted in turbine to electricity is less than 1.5MW electricity. Also talking about power (MW), but not energy (MWh) is bit strange, and to me sounds that it is just peak what they got.